MCP structured content
Category: protocol
Renders `structuredContent` (JSON payloads) in a useful way rather than discarding it — e.g. pretty-printed JSON, structured table, or widget rendering.
Support by client
| Client | Status | Notes | Verified |
|---|---|---|---|
 Claude Web | unsupported | structuredContent absent from model context. Model report: 'I received the text content block (call id 720847). However, I did NOT receive a visible structuredContent. No JSON profile or item array appeared in the tool result... So from the model's perspective in this client: structuredContent absent (or at least not passed into the model context alongside the text block).' No dedicated UI panel for structured data either. Call id: 720847. | 2026-07-05T15:59:25.702Z |
| Claude Desktop | unsupported | Assistant response is plain text only; it reports receiving the text block but says structuredContent was not surfaced back, with no rich/structured rendering visible. | 2026-07-08T15:02:43.911Z |
| Claude Mobile | unsupported | structuredContent JSON dropped: model reports only the text block arrived, item array absent (call id 51a76d). Automated via Mirroir. | 2026-07-09T17:55:22.168Z |
| Claude Voice | unknown | — | |
| Claude Code | supported | The model's reply referenced fields that exist only in the structuredContent payload — the client fed structured content to the model. | 2026-07-04T15:50:04.378Z |
 ChatGPT Web | supported | Model consumes structuredContent: markdown probes's {nonce} JSON was reproduced verbatim in replies. Note: when structuredContent is present, ChatGPT web feeds it to the model INSTEAD of content[].text — text blocks are shadowed. | 2026-07-05T15:30:28.177Z |
| ChatGPT Mobile | unknown | — | |
| ChatGPT Voice | unknown | — | |
| ChatGPT Desktop | unknown | — | |
| Codex CLI | supported | The model's reply referenced fields that exist only in the structuredContent payload — the client fed structured content to the model. | 2026-07-04T15:52:42.711Z |
 Siri | unknown | — | |
| Apple AI (ChatGPT) | unknown | — | |
 Gemini Web | unknown | — | |
| Gemini Mobile | unknown | — | |
| Gemini Voice | unknown | — | |
| Gemini CLI | unsupported | The model echoed the tool response's nonce but referenced none of the structuredContent payload fields — the client likely surfaced only the text fallback. | 2026-07-08T15:43:59.083Z |
 Antigravity | unknown | — | |
 Cursor | unknown | — | |
| Cursor CLI | unsupported | The model echoed the tool response's nonce but referenced none of the structuredContent payload fields — the client likely surfaced only the text fallback. | 2026-07-04T15:46:08.084Z |
 VS Code (Copilot Chat) | unknown | — | |
 GitHub Copilot CLI | supported | The model's reply referenced fields that exist only in the structuredContent payload — the client fed structured content to the model. | 2026-07-04T15:43:15.838Z |
 Windsurf | unknown | — | |
 Zed | unknown | — | |
 Perplexity Web | unknown | — | |
| Perplexity Mobile | unknown | — | |
| Perplexity Voice | unknown | — | |
| Comet Browser | unknown | — | |
 Grok Web | unknown | — | |
| Grok Mobile | unknown | — | |
| Grok Voice | unknown | — | |
| Grok CLI | unsupported | The model echoed the tool response's nonce but referenced none of the structuredContent payload fields — the client likely surfaced only the text fallback. (tool_use event and debug log both missed; inferred toolCalled from call-id echo) | 2026-07-04T15:50:10.896Z |
 Warp | unknown | — | |
 Amp | unknown | — | |
 Goose CLI | supported | The model's reply referenced fields that exist only in the structuredContent payload — the client fed structured content to the model. (stream event did not name the tool; inferred toolCalled from call-id echo) | 2026-07-04T15:44:41.748Z |
| Antigravity CLI | unsupported | The model echoed the tool response's nonce but referenced none of the structuredContent payload fields — the client likely surfaced only the text fallback. | 2026-07-04T15:46:18.735Z |
 JetBrains AI Assistant | unknown | — | |
 Ollama | unknown | — | |
 LM Studio | unknown | — |